Definition: In this task, you are given an input list A. You need to convert all the alphabets in the list with a number representing their position in the English alphabet. E.g., replace A by 1, B by 2, a by 1, b by 2, and so on.
Input: ['E', 'o', 'n', '359', 'M', '1029', '7853']

5, 15, 14, 359, 13, 1029, 7853